Elon Musk, CEO of Tesla and chairman of SolarCity, introduced highly anticipated solar roof tiles and the newest Powerwall energy storage product during an event at Universal Studios in Los Angeles on Friday. The joint Tesla/SolarCity launch event came as the entrepreneur continues to make his case for Tesla’s proposed acquisition of SolarCity, which shareholders are slated to vote on in November. During the presentation, Musk reiterated his vision for houses with rooftop solar and integrated energy storage that can power both the homes and Tesla electric vehicles parked in their garages. “People think of Tesla as an electric car company, but really the whole purpose of Tesla was to accelerate the advent of sustainable energy,” he said, calling the integration of the clean energy products an “obvious three-part solution.” Although typical residential solar installations in...